158 OBSERVATIONS ON THE CHAROPIDiE, 



Under this head he assembled these species : — portia, Gray ; 

 pinicola, Pfr. ; juloidea, Forbes ; eta, Pfr. ; ide, Gray ; varicosa, 

 Pfr. ; epsilon, Pfr. ; coma, Gray ; anguiculus, Reeve ; gamma, 

 Pfr. ; hiconcava, Pfr. ; omicron, Pfr. ; zeta, Pfr. ; dimorpha, Pfr. ; 

 hypopolia, Pfr. ; sericatula, Pfr. ; iota, Pfr. ; kappa, Pfr. ; egesta, 

 Gray ; dianw, Pfr. ; alpha, Pfr. ; and 6eto, Pfr. 



Considering the scanty material and information at the disposal 

 of this sagacious naturalist, we may well admire his sketch of the 

 affinities of this group, and regret that later writers have not 

 followed the path indicated by the systematist of the last genera- 

 tion. 



The only other reference to such a classification is the following 

 remark by Pease (P.Z.S. 1871, p. 450), the fruits of an unrivalled 

 knowledge and unremitting study of the land mollusca of Poly- 

 nesia : — "Thirty-five or more species of Helices have been described 

 from the Papuan Islands, Australia, Tasmania and New Zealand 

 under the genera Patula, Discus, &c., which are more nearly 

 related to the Polynesian genus Pitys. They are generally more 

 planorboid in shape, with the aperture open and not laminate or 

 dentate ; their relation to the genus Pitys cannot be determined 

 until the animals are examined and compared." 



From the same article, p. 451, I extract the characters of the 

 genus Pitys, Beck, first defined in the " Index Molluscorum," 

 1837, and whose type is P. oparica, Anton, as amended by Pease. 



Pitys, Beck (1837). 



" Shell orbicular or planorboid, finely radiately ribbed ; spire 

 but slightly elevated, last whorl rounded at its periphery and also 

 at the umbilicus, more or less openly umbilicate, rarely imper- 

 forate ; aperture generally dentate or laminate ; radiately striped 

 or tessellated on their upper surface with reddish-brown and 

 yellowish, the stripes occasionally taking a zigzag form on the 

 periphery and base ; rarely wholly reddish-brown ; generally 

 covered with a thin epidermis, which, on a few species, supports 

 short hairs." 



